<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>子代选择器</title>
	<style>
		/*  */
		
		
		.parent>span{
			font-size: 50px;
		}
	</style>
	
	</head>
	
	<body>
		<div class="parent">
			<span>小米官网</span>
		</div class="child">
		<div>
			<span>京东官网</span>
		</div>
		
	</body>
</html>